Mortar-board.



F. KLEPACH.

MORTAR'BOAHD.

APPLICATION FrLED MAR.26,1914.

l, 174,994. Patented Mar. 14, 1916.

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FRANK KLEXPVACH, .OF CEDAR RAPIDS, IOWA.

VMo:tiran-BOARD.

Specification of Letters Patent. 'Patented Mar. 14,1916.

application area March 26,1914. serial 110,827,363.

To all whom it may concern.'

v Be it known that I,Fn.ank KLnraoH, a

citizen of the United States, residing at Cedar Rapids, in the county of Linn and Y State of Iowa, have invented certain new and useful Improvements in Mortar-Boards, of which the following is a specification.

The object of this invention is to produce a mortar-board adapted to keep mortar from freezing, and at a proper temper for use in freezing weather.

The -invention consists in a novel mortarboardand means for applying heat and moisture thereto, the invention being hereinafter fully described and claimed.

In the accompanying drawing, forming a part of this specification, Figure 1 is a plan` view of a device embodying my invention. Fig. 2 is an elevation of the same, as seen from the right side of Fig. 1. Fig. 3 is a section in the line a @looking in the same direction.

In the drawing, 1 designates the board, which in practice is composed of a series of slats 2 of thin material, such as lath, fastened, as by screws 3. to cross-bars 1l. The cross-bars are preferably of galvanized steel, offset at 5, and with terminal eXtensions 6. The slats are set slightly apart, enough to permit steam to pass between them, but near enough together to hold mortar.

The mortar-board rests, by its extensions 6. cn the margin of a pan 7, the edges of which are flanged outwardly at 8. As will be Seen, the board fits neatly inside the pan, with its upper surface about flush with the top thereof, and is thus held by the pan against movement in anv direction. The pan should be of some suitable non-rusting material. such as galvanized steel.

Supporting the pan and the mortar-board by suitable brackets 9 is a rectangular heating chamber 10, made of similar material. As will be seen bv reference to Fig. 3. the pan 7 is held by the brackets a little above the top of the heating chamber to permit the hot air to pass out at the top. The projecting flanges of the water-pan 7 cover this space, and thus prevent mortar or dirt from falling into the air-chamber. The admissionV of air to this chamber is regulated by a suitable damper 11.

` On brackets 12 attached to the hot-air chamber is mounted a tank 13 for liouid fuel, preferably kerosene. The depending able valve ,15and this witlra pipe 16. An elbow at the lower end of the pipe connects with a pipe 17 extending inside the airchamber, and forming a ring in the middle thereof, as shown in Fig. 3, and as indicated by the dotted outline in Fig. 1. The top of this ring is pierced, each side of the center, with a large number of small holes for the escape of the liquid or gaseous fuel. In practice the pipe ring is wrapped with asbestos 18. This has the effect of retarding the escape of liquid kerosene until rendered gaseous, or semi-gaseous by the heat of the burner, and thus largely avoiding smoke. It also has the effect of diffusing the escaping hydro-carbon, so that the flame is practically continuous. instead of issuing in jets, as indicated in Fig. 3.

A slot 19 admits the burner pipe, and allows the whole heating apparatus to be lifted out and replaced in a moment.

When in use the whole apparatus is placed on supporting blocks or brick 20, which may be continuous on the Windward side, and thus shield the damper from the effect of any wind that might be sufiicient to disturb the flame of the burner. The location of the damper, central to the ring of the burner, is such, however, that ordinary winds do not injuriously affect the action of the burner.

The operation of the device is clearly indicated in Fig. 3. The pan 7 is supplied with water, which soon boils and gives oft' steam. This supplies the mortar 21 with an ample amount of moist heat, preventing freezing, and also preventing the drving out of the mortar which w^uld take place if a dry heat were used. The action of the hot steam extends to every part of the board, and keeps in a plastic condition even the spatterings from the workmans trowel, which otherwise would be the first to freeze. The operator is thus enabled to use all the mortar, and in as good condition in winter as in summer, with corresponding eiiiciency in the amount and character of his work.

Having thus described my invention, I claim:

1. A mortar-board and mortar-warming apparatus, comprising a flat-topped board with narrow slits or cracks therein to permit the passa ge of steam but prevent the passage of mortar therethrough. a water pan supporting said board practically flush with its 2r l Y 1,174,994

upper edge, a heatchamber supporting'said pan and board, and means adapted to supply heat tov said chamber.

2. In combination with a Water-pan andl 10 *iside the board, whereby said board is adapt- Ycopies of thispatet may be obtained for veleents been, by addressing the fcqmmivssioner gf Patente: Y

ed to rest inside the' upper part of said pan and -With its upper surface practically flush With'the top thereof. f q

In testimony whereof VI aiiix my signature in presence of tworwitnesses. Y Y

Witnesses: f.

S. F. N ovoTNY, i J. M. ST. JOHN. j v

Washington, D. C.

Y FRANK KLEPACH. Y i 

